<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body></body>
  <script>
    // toString  是对象的原型链上的方法，js中万物皆对象，所以都能调用
    const arr = [1, 2, 3];
    // alert(arr.toString());
    // const obj = { name: 'zs' };
    // alert(obj.toString());

    // join是数组特有的
    alert(arr.join('/'));
  </script>
</html>
